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NyankoTools
日本語

Updates

A history of the new tools and features we've added to NyankoTools.

  1. Added 17 new tools.

    • Aim TrainerClick 20 targets to measure your average hit time, accuracy and misses. Best score saved in your browser.
    • Whack-a-Mole GameWhack the cats popping out of holes in 30 seconds. It speeds up as you play and saves your best score.
    • Color & Sound Memory GameRemember and repeat the order of four glowing, sounding panels. Keys 1-4 supported.
    • Number Memory TestMemorize a number flashed on screen and type it back. One more digit each round.
    • Cat ClickerA cozy idle clicker: pet the cat, buy upgrades and watch fish pile up. Progress is saved in your browser.
    Show 12 more
    • Tower of HanoiPlay the Tower of Hanoi with 3 to 8 discs, compare your moves with the minimum, and watch the optimal solution.
    • Cat Jump GameFlap a cat through pipe gaps with one button. Tap, click or press Space. Saves your best score. Free, mobile friendly.
    • Peg SolitaireJump pegs to remove them and leave just one. English 33-hole and European 37-hole boards, with undo.
    • HangmanGuess the hidden English word one letter at a time. Pick a category like animals, food or travel.
    • Tic-Tac-ToePlay against the computer at three levels, including an unbeatable minimax mode. Choose to move first or second.
    • Gomoku (Five in a Row)Play Gomoku against the computer on a 15×15 board. Four levels, choose first or second, undo moves, no restricted moves.
    • Box Push PuzzlePush every box onto a goal across 20 levels. Arrow keys, swipe or buttons, undo, and best-move records. Free browser puzzle.
    • BlackjackPlay blackjack against a computer dealer. Hit, stand or double down with virtual chips that have no cash value. For fun only.
    • Optical Illusions GalleryTry 9 classic optical illusions such as Müller-Lyer and café wall. Show guide lines to see what is really equal or parallel.
    • One-Stroke PuzzleTrace every line exactly once in one stroke. Three difficulty levels with undo, hints and endless new puzzles.
    • 5-Letter Word Guessing GameGuess the hidden five-letter English word in six tries, using green, yellow and gray clues.
    • Large Number ChartIdle-game number cheat sheet: compare commas, K/M/B/T suffixes and Japanese units (万・億・兆), and convert any value.

  2. Added 17 new tools.

    Show 12 more
    • Video MergerJoin multiple videos into one MP4 or WebM in your browser. Reorder clips; size and fps follow the first video. Silent clips are padded. No upload.
    • Audio Silence RemoverDetect silent parts in audio on a waveform, then cut or shorten them with a dB threshold, minimum length and padding. Save as WAV.
    • Screenshot CaptureTake a screenshot of your screen, a window or a browser tab in the browser and save or copy it as PNG. Delay timer included. No install needed.
    • Week Number CalculatorFind the ISO week number, ISO year, weekday, day of year and quarter for any date, or look up a week's Monday-to-Sunday dates.
    • Device Info ViewerView screen resolution, DPR, CPU cores, memory, GPU, touch input and supported Web APIs, and copy the report.
    • MIDI Device TesterCheck MIDI keyboard and controller connections in your browser and watch notes, CC and pitch bend live
    • Duplicate File FinderFind duplicate files by SHA-256 hash from multiple files or a folder, see the wasted space per group, and copy or export the results as CSV.
    • File Splitter & JoinerSplit a large file into .001, .002 parts of any size to fit email limits, then join them back into the original.
    • Bulk File RenamerRename many files with numbering, find and replace, and case changes, then save them as a ZIP
    • Hex ViewerView any file as hex and ASCII, jump to an offset, and search for hex or text bytes, even in large files
    • Coin TossFlip a coin online and see heads or tails on a 3D coin. Flip several times in a row and track history and streaks using cryptographic randomness.
    • Loto & Numbers Number PickerPick random numbers for Japan’s Loto 6, Mini Loto, Loto 7 and Numbers 3/4, just for fun. Runs in your browser.

  3. Added 16 new tools.

    • Photo Collage MakerMake a collage from 2-9 photos with layout templates. Set spacing, borders, corners and background; save as PNG, JPEG or WebP. Runs in your browser.
    • Document Scan Filter (Shadow Removal & B&W)Remove shadows and whiten phone photos of documents. Choose color, grayscale or black & white. Runs in your browser; nothing is uploaded.
    • SVG Path ViewerSplit an SVG path d attribute into commands and see start, end and control points on the shape. Edit coordinates or trim decimals.
    • Color MixerMix two colors by ratio and generate N intermediate shades in RGB or OKLab
    • GIF Splitter & Speed ChangerSplit an animated GIF into frames and save a PNG sequence as ZIP, or change the frame delay in bulk and rebuild the GIF. Runs in your browser, no upload.
    Show 11 more

  4. Added 31 new tools.

    • Cron Expression GeneratorBuild cron expressions visually by picking minute, hour, day, month and weekday. Supports steps, ranges, lists and Quartz output.
    • ISO 8601 Duration ConverterConverts ISO 8601 durations (PT1H30M, P1Y2M3D, P2W) to seconds, minutes, hours and days, converts seconds back, and adds a duration to a date.
    • Cookie Parser (Cookie & Set-Cookie)Parses Cookie and Set-Cookie headers into name, value, Domain, Path, Expires, Max-Age, Secure, HttpOnly and SameSite, and flags common mistakes. Values are masked.
    • umask CalculatorFind the permissions new files and directories get from a umask, or work back to the umask you need.
    • docker run to docker-compose ConverterConverts a docker run command to a docker-compose.yml file. Handles ports, volumes, env vars, --name and --restart, and warns about options it cannot convert.
    Show 26 more
    • Regex ExplainerBreak a regular expression into character classes, quantifiers, groups, lookarounds and flags, and read what each part does. Syntax errors show their position.
    • CSS Unit ConverterConvert px, rem, em, vw, vh, vmin, ch and pt between each other with your viewport and font sizes.
    • Fetch / Axios to cURL ConverterConverts JavaScript fetch or axios code to a curl command. Handles method, headers, JSON bodies, and FormData; it only parses the code and never runs it.
    • Wi-Fi QR Code GeneratorCreate a Wi-Fi QR code from an SSID and password. Supports WPA, WEP, open and hidden networks
    • Tokushoho Notice Generator (Japan Commercial Transactions Act)Draft the legal disclosure page required for online sales in Japan from the required items, as text, Markdown or HTML. A template, not legal advice
    • Privacy Policy Template GeneratorGenerate a privacy policy template with Google Analytics, AdSense, cookie and affiliate clauses (Japan). Not legal advice
    • Daily Proration CalculatorProrate monthly rent, salary or subscription fees by days or dates, with calendar, 30-day or 365-day basis and rounding options
    • Business Card MakerMake a 91 × 55 mm business card with a vCard QR code and print it life-size, 10 per A4 sheet.
    • Resume Maker (Rirekisho)Make a Japanese resume (rirekisho) in a JIS-style layout and print it on A4. Add an ID photo and save a draft in your browser. Nothing is uploaded.
    • Luhn Checker & Card Brand DetectorValidate card numbers with the Luhn algorithm and detect the brand by IIN. Includes public payment test numbers.
    • ISBN & EAN-13 Check Digit ValidatorValidate or calculate ISBN-10, ISBN-13 and EAN/JAN check digits and convert ISBN-10 to ISBN-13.
    • JWK to PEM ConverterConvert JWK to PEM (SPKI / PKCS#8) and PEM back to JWK for RSA, EC, and Ed25519 keys. Runs in your browser; nothing is sent.
    • Shamir's Secret Sharing (Split & Combine)Split a text secret into n shares and recover it from any k of them with Shamir secret sharing. Runs in your browser.
    • RSA Encrypt & DecryptEncrypt with a PEM public key using RSA-OAEP and decrypt with the private key
    • Digital Signature ToolCreate and verify digital signatures with RSA-PSS or ECDSA using PEM keys. Output is Base64.
    • Lat/Long Converter (DMS) & Distance CalculatorConvert latitude and longitude between decimal degrees and DMS, and calculate distance, bearing and midpoint of two points with Haversine.
    • Ohm's Law CalculatorFind voltage, current, resistance or power from any two. Also series/parallel resistance and LED resistor values.
    • Print Size ConverterConvert mm, pt, px and inches by DPI, with an A-series and B-series paper size chart
    • Resistor Color Code CalculatorRead 4-, 5- and 6-band resistor color codes or convert a resistance to bands, with tolerance and the nearest E series value.
    • Compress Image to Target SizeCompress an image to under a target file size such as 200KB. JPEG or WebP quality is found automatically.
    • Image DPI ChangerChange PNG/JPEG DPI without re-encoding and check the print size in mm and paper fit
    • Image Diff (Pixel Comparison)Compares two images pixel by pixel and shows the difference rate on a heatmap. Set a tolerance, handle mismatched sizes, and save the diff as PNG.
    • Image Logo WatermarkOverlay a logo on an image with nine positions, size, opacity, margin, rotation, and tiling. Save as PNG or JPEG. Runs in your browser; no upload.
    • Meme GeneratorAdd bold outlined top and bottom captions to any image to make a meme. Text auto-shrinks and wraps to fit. PNG/JPEG, in your browser.
    • Sticker Outline MakerAdd a sticker-style outline to a cutout PNG, with custom width and color, a double border, a shadow, and hole filling.
    • Screen Color PickerPick any color on your screen with the eyedropper and get HEX, RGB and HSL codes. Image mode for other browsers.

  5. Added 25 new tools.

    Show 20 more

  6. Added 40 new tools.

    • Audio MergerJoin several audio files into one with reordering, crossfades, silent gaps and fade in/out. Preview and save as WAV in your browser.
    • BPM to Delay Time CalculatorConvert BPM to delay times in ms and Hz per note value, plus reverb pre-delay and decay guides.
    • Noise Meter (Sound Level in dB)Measure ambient noise in approximate dB with your microphone. Shows current, max and average levels, a graph and a noise guide. Nothing is recorded.
    • Screen Ruler (cm / inch, actual size)Show an actual-size cm and inch ruler on screen. Calibrate it by matching the frame to a credit card; horizontal and vertical modes.
    • Spirit LevelCheck if a surface is level with your phone’s tilt sensor. Bubble, angle and slope, plus zero-point calibration.
    Show 35 more
    • Motion Blur & Frame Skip TestCheck ghosting, motion blur and skipped frames with a moving object in full screen
    • Monitor Gamma & Banding TestCheck gamma, banding and black/white clipping on your monitor with fullscreen gray ramp, step and gamma checker patterns.
    • Hearing Test (Mosquito Tone)Play high-frequency tones from 8 to 20 kHz to check your hearing range, with a rough age guide.
    • Unit Price ComparatorCompare products by price per 100 g, 100 ml or item. Handles 3+ products, pack counts and tax, and shows the cheapest and the gap.
    • Savings Goal CalculatorEnter two of target amount, time frame and monthly savings to solve the third. Handles a starting balance and 0% interest, with a yearly table.
    • Rental Initial Cost CalculatorEstimate upfront rental costs in Japan (deposit, key money, agent fee, prepaid rent) and a rent guide from income.
    • Bonus Take-Home Pay Calculator (Japan)Estimate your net bonus in Japan after social insurance and withholding income tax, from the gross bonus and last month’s pay (2025 brackets).
    • Japan Income Wall Checker (Take-Home Reversal)Check Japan’s income walls (¥1.06M, ¥1.3M, ¥1.6M) for part-timers and dependents and see where take-home pay drops. Estimate only.
    • Unemployment Benefit Calculator (Japan)Estimate Japan's unemployment insurance basic allowance: daily amount, benefit days and waiting period by age, insured period and reason.
    • Childcare Leave, Maternity & Sickness Benefit Calculator (Japan)Estimate Japan’s childcare leave benefit (67% / 50%), maternity allowance and sickness allowance from your pay and standard remuneration.
    • Retirement Allowance Tax CalculatorEstimate tax on a Japanese retirement allowance: retirement income deduction, half taxation, income tax and resident tax.
    • Rental Property Yield CalculatorEstimate gross yield, net yield (NOI) and cash flow after loan payments for a rental property.
    • Macro (PFC) CalculatorCalculate daily protein, fat, and carb grams from your calorie target and macro ratio. Estimate calories from BMR and activity.
    • Sleep CalculatorWork out your bedtime or wake-up time from 90-minute sleep cycles, with an adjustable time to fall asleep.
    • Pet Age Calculator (Dog & Cat)Convert your dog's or cat's age to human years, with a chart by dog size.
    • Cooking Unit ConverterConvert tablespoons, teaspoons, cups, grams and ml for flour, sugar, butter, honey and more, with a weight chart.
    • Recipe ScalerScale an ingredient list to any number of servings. Handles fractions, ranges and units
    • Wallpaper, Paint, Tile & Flooring Quantity CalculatorEstimate rolls of wallpaper, cans of paint, and tiles or flooring boxes from room size, minus doors and windows, plus waste.
    • A/B Test Significance & Sample Size CalculatorCheck if an A/B test result is significant (p-value, z-test, confidence interval) and estimate the sample size you need.
    • Linear Regression & Correlation CalculatorFit a least-squares regression line to x,y data: slope, intercept, correlation r and R², with a scatter plot and predictions.
    • Matrix CalculatorAdd, multiply, transpose and invert matrices up to 6x6 and find determinants, with exact fractions or decimals.
    • Quadratic & Linear System SolverSolve quadratic equations and 2- or 3-variable linear systems with step-by-step working, including complex roots and no-solution cases.
    • Area & Volume CalculatorFind the area of circles, triangles and trapezoids and the volume of cylinders, cones, spheres and boxes, with formulas and steps.
    • Japanese Lucky Day Calendar (Tensha, Ichiryumanbai, Tora)Find Japanese lucky days (Tenshanichi, Ichiryumanbai, Tora, Mi) and unlucky Fujoju days. Filter by wedding, business launch or wallet.
    • Nine Star Ki (Kyusei Kigaku) CalculatorLook up your Nine Star Ki year star and month star from your birth date, with element and a year-to-star chart.
    • Shift Schedule Maker (Auto-Assign, Printable)Make a printable monthly shift or duty roster. Auto-assigns fairly, honors days off and a max streak, and exports CSV.
    • Breakout GameClassic brick-breaker: bounce the ball off the paddle and clear every brick. Play with mouse, touch or keys.
    • Four in a RowDrop discs and line up four to win. Play the computer at three levels as first or second player.
    • Hit and Blow Number Guessing GameGuess a hidden 3–5 digit number from Hit and Blow clues. Choose repeated digits or not, review your guess history, or give up to see the answer
    • Lights OutLights Out puzzle: pressing a cell flips its neighbors. 3×3 to 7×7, always solvable, with a move counter and hints.
    • Mental Math TrainerPractice mental arithmetic with a rank and best score. Choose operations, digits and a time limit.
    • Function GrapherPlot y=f(x) graphs online. Overlay up to 6 functions, pan and zoom, switch degrees/radians and save as PNG.
    • Scientific CalculatorOnline scientific calculator with trig, logs, roots, powers and factorials. Keyboard input, degrees/radians, history.
    • Passport Romaji Name ConverterConverts a Japanese name in kana to passport Hepburn romaji: long O/U vowels omitted, M before B/M/P, optional OH spelling.
    • Image Reveal MaskCover an image with a solid color and cut out shapes like circles, stars and hearts to reveal the original underneath.

  7. Added 25 new tools.

    • CSS Filter GeneratorBuild CSS filter code with live preview: blur, brightness, contrast, grayscale, hue-rotate, drop-shadow and more.
    • CSS Transform GeneratorBuilds CSS transform declarations with a live preview: translate, rotate, scale, skew, 3D rotation, perspective, and origin.
    • CSS Specificity CalculatorCalculate CSS selector specificity (a, b, c) line by line and compare selectors to see which rule wins.
    • CSS Button & Toggle Switch GeneratorGenerate CSS buttons, pure-CSS toggle switches, triangles and arrows with hover effects, a live preview and contrast check.
    • CSS Pattern Background GeneratorGenerate stripe, polka dot and checkerboard backgrounds as CSS gradients or SVG, preview them and copy the code.
    Show 20 more
    • mailto, tel & SMS Link GeneratorGenerate mailto, tel and SMS links with subject, body, CC and BCC. Get an encoded href and an HTML anchor tag.
    • ICS File GeneratorCreate an .ics calendar event file or Google Calendar link with recurrence, reminders and all-day events.
    • vCard Generator (.vcf & QR)Create a vCard (.vcf) contact file and a contact QR code from name, phone, email and address.
    • Math Drill GeneratorMake printable addition, subtraction, multiplication and division worksheets with an answer sheet.
    • Envelope Address PrinterPrint recipient and sender addresses on Japanese envelopes at true size, with postal code boxes, vertical or horizontal.
    • Passphrase Generator (Diceware)Generate memorable Diceware passphrases from the EFF large wordlist (7,776 words), with word count, separator and entropy options.
    • SPF & DMARC Record GeneratorBuild SPF and DMARC TXT records and check existing ones for the 10-lookup limit, +all, and pct errors. No DNS queries.
    • Email Header AnalyzerPaste raw email headers to trace the Received path and hop delays, read SPF, DKIM and DMARC results, and spot From mismatches.
    • Image Compare SliderCompare two images with a draggable before/after slider. Switch horizontal or vertical, show labels, and save a side-by-side PNG.
    • Image Frame Maker (Polaroid, Border & Rounded)Add Polaroid, border, picture-frame, rounded and shadow frames to photos. Pick the color, thickness and corners and save as PNG, JPEG or WebP.
    • Gradient Wallpaper GeneratorCreate linear, radial or conic gradient wallpapers at any resolution and save as PNG or JPEG.
    • Device Mockup Generator (Phone, Laptop & Browser)Put a screenshot into a phone, tablet, laptop or browser frame and save the mockup as a PNG. Transparent background and shadow options.
    • Avatar Generator (Initials & Identicon)Makes avatar icons from initials or a seed string (GitHub-style identicon), with color, shape and font options, and saves them as PNG.
    • Tailwind Color Scale GeneratorGenerate a Tailwind-style 50-950 color scale from one base color. Copy as CSS variables, Tailwind v4 @theme or tailwind.config.js.
    • Pixel Art EditorDraw pixel art in your browser with pen, eraser, fill and picker tools, then export a scaled transparent PNG.
    • Screenshot AnnotatorPaste a screenshot and add arrows, boxes, numbered badges and text, then save as PNG. Runs in your browser.
    • Audio Speed & Pitch ChangerChange audio speed and pitch (key) in semitones, preview, and save as WAV. Runs in your browser.
    • Noise GeneratorPlay white, pink or brown noise for focus and sleep, with a timer and fade-out.
    • Virtual PianoPlay a piano with your computer keyboard, mouse or touch. Four sounds and octave shift.
    • Mosaic to Smooth GradientReplace a mosaic area with a smooth color blend built from its blocks and the surrounding pixels.

  8. Added 20 new tools.

    • Punycode ConverterConvert IDN domains to xn-- Punycode and back
    • JSON5 ⇔ JSON ConverterConvert JSON5 or JS object literals to JSON and back. Handles comments, trailing commas, unquoted keys and hex numbers, with line and column errors.
    • Markdown Table EditorEdit a Markdown table in a grid: add, delete and reorder rows and columns, set alignment, copy padded output
    • Rock Paper Scissors GamePlay rock paper scissors against the CPU and track your win streak, best streak and total record.
    • IP Address ConverterConvert IPv4 to decimal, hex and binary, and compress or expand IPv6 addresses. The input format is detected automatically.
    Show 15 more
    • Semver CalculatorCompare semver versions and check ranges (^ ~ >= || x, hyphen) with prerelease support, npm-compatible.
    • JSON-LD Structured Data GeneratorGenerate JSON-LD structured data for FAQ, Article, Product and BreadcrumbList from a form, and copy the script tag.
    • UTM BuilderBuild campaign URLs with UTM parameters. Presets, bulk URLs and history. Runs in your browser.
    • Htpasswd Generator (Basic Auth, bcrypt/SHA-1)Generate .htpasswd lines for Basic auth with bcrypt or SHA-1, for multiple users, plus Authorization headers.
    • nginx Redirect GeneratorGenerate nginx config for forced HTTPS, www canonical, trailing slashes and 301/302 redirects
    • Port Number List & SearchLook up TCP/UDP port numbers like 22, 80, 443, and 3306 by number, range, or service name, with their uses.
    • HTML Table GeneratorBuild an HTML table by choosing rows and columns. Merge cells with colspan and rowspan, add a header row, and copy the code with CSS.
    • Date Format String BuilderBuilds date format strings for strftime, Java, PHP, Day.js/Moment.js and .NET from a sample, and converts between them.
    • Regex Pattern LibraryCopy-ready regex patterns for Japanese postal codes, phone numbers, katakana, email, URL, IPv4, dates, and UUIDs, with match and non-match examples.
    • Bitwise CalculatorCalculate AND, OR, XOR, NOT, shifts and rotates for 8/16/32/64-bit values, with a bit-by-bit view and two's complement.
    • IEEE 754 Float ViewerView float32/float64 sign, exponent and mantissa bits, convert from bits, and see why 0.1+0.2 is off. Handles NaN, Infinity, subnormals.
    • Clipboard InspectorList pasted clipboard formats: MIME types, HTML source, images and files
    • Snowflake ID, ObjectID & UUID Timestamp DecoderDecode the creation time and parts of Snowflake IDs, MongoDB ObjectIDs, UUID v1/v6/v7 and ULIDs. Batch decoding supported.
    • Open Source License GeneratorGenerate MIT, Apache-2.0, BSD, ISC and other license text with your name and year, plus SPDX IDs.
    • Directory Tree Diagram GeneratorTurn an indented folder list into a ├── └── tree for your README. Aligned comments, depth folding, ASCII style and reverse conversion.

  9. Added 16 new tools.

    • Word Frequency CounterCount how often each word or character appears in your text, rank the top results and export as CSV
    • Unicode NormalizerConvert text to Unicode NFC, NFD, NFKC or NFKD, fix decomposed dakuten, and see which characters changed.
    • Text Extractor (Emails, URLs, Phones)Extract emails, URLs, phone numbers, dates and hashtags from text, with duplicate removal.
    • Indent ConverterConvert leading indentation between tabs and spaces, or change the indent width. Only line-start whitespace changes.
    • ASCII Table GeneratorTurn CSV, TSV or Excel cells into an ASCII or Unicode box-drawing text table for READMEs and code comments.
    Show 7 more
    • Shell, Regex, SQL, CSV & JSON String EscapeEscape and unescape quotes and special characters for shell, regex, SQL, CSV and JSON strings.
    • URL Slug GeneratorTurn titles, including Japanese, into clean URL slugs: kana to romaji, symbols stripped, hyphen-separated, with a length limit.
    • Memorization Sheet MakerWrap key terms in ** to hide them like a red study sheet. Click to reveal answers and print hidden or revealed.
    • Vertical Text ConverterConvert horizontal Japanese into vertical text for social posts, with vertical punctuation, one-per-line or column layouts, and a vertical preview.
    • Base32/58/62/85 & Hex EncoderEncode or decode text as Base16 (hex), Base32, Base58, Base62 or Base85 in your browser.
    • Text to Binary / Hex ConverterConvert text to binary, octal or hex bytes in UTF-8, UTF-16 or Shift_JIS, and back
    • Checksum CalculatorCalculates CRC-32, CRC-16, Adler-32, and Fletcher checksums of text or files.

  10. Added 4 new tools.

  11. Added 7 new tools.

    • Loan & Revolving Payment CalculatorEstimate monthly payments, total interest and payoff time for amortizing, equal-principal and revolving credit, with a repayment schedule.
    • Size Converter (Clothing, Shoes & Rings)Convert women’s and men’s clothing, shoe and ring sizes between Japan, US, EU and UK. A handy guide for overseas shopping.
    • Refresh Rate Test (60/120/144Hz)Measure your monitor or phone refresh rate in Hz from browser frame timing and see whether it is 60Hz, 120Hz, 144Hz and more.
    • Touch Screen Test (Multi-Touch & Ghost Touch)Swipe the screen to check simultaneous touch points, drag trails, dead zones and ghost touches. Useful for diagnosing phone and tablet touch problems.
    • Snake GameThe classic Snake game: eat food to grow, avoid walls and your own tail. Arrow keys, WASD, swipes or on-screen buttons, with a saved best score
    Show 2 more

  12. Added 8 new tools.

    • JWT GeneratorGenerate HMAC-signed JWTs (HS256/HS384/HS512) from a header, payload and secret for API auth debugging and learning.
    • CSV/JSON to SQL INSERT GeneratorGenerates INSERT statements (optionally with CREATE TABLE) from CSV or JSON, with MySQL/PostgreSQL/SQLite quoting and type inference.
    • CSV Viewer (Sort & Filter)View CSV as a table, sort by column, filter rows, reorder or remove columns and export again. Virtual scrolling keeps big files fast.
    • CSS clip-path GeneratorBuild clip-path shapes by dragging polygon points, or use circle, ellipse and inset, with presets like triangle, star and speech bubble.
    • SVG Wave & Blob GeneratorGenerate SVG wave section dividers and organic blob shapes. Adjust waves, amplitude, randomness and color, reproduce with a seed, and copy SVG or CSS.
    Show 3 more
    • Color Blindness SimulatorSimulate how an image or color code looks with protanopia, deuteranopia, tritanopia or total color blindness. Check design accessibility and contrast.
    • Image Splitter (Grid & Instagram 3x3)Split an image into equal rows and columns and save all tiles as one ZIP. Supports the Instagram 3x3 grid, 3-panel carousels and 2x2, as PNG, JPEG or WebP.
    • Graph Paper, Lined & Dot Grid GeneratorMake printable graph paper, lined paper or dot grid sheets in A4, A3, Letter and more with an exact cell size in mm. Print or save as SVG.

  13. Added 11 new tools.

    • Japanese Braille Converter (Kana ⇔ Unicode Braille)Convert Japanese kana to six-dot braille in Unicode characters and back, with voiced marks, yoon, sokuon and number signs plus per-cell dot numbers
    • Number to Words ConverterConvert a number to English words, ordinals and check-writing format (and 50/100 dollars), plus its Japanese reading in hiragana, with British "and" support
    • HTML Tag StripperStrips HTML tags and extracts plain text. Keeps line breaks, collapses whitespace, optionally keeps link URLs. Scripts are never executed.
    • Number Sequence & Date List GeneratorGenerate zero-padded number sequences and date lists with weekdays, skipping weekends
    • Paid Leave Days Calculator (Japan)Calculate annual paid leave grant dates and days in Japan from your hire date and weekly schedule, including proportional grants.
    Show 6 more

  14. Added 19 new tools.

    • Newline to Comma & Delimiter ConverterConvert between newline, comma, tab, space, and custom delimiters. Trim, dedupe, and quote items.
    • Morse Code TranslatorTranslate text to Morse code and back, including Japanese Wabun kana. Play it as sound or a light flash at a chosen speed (WPM) and tone.
    • Classical Cipher Tool (Caesar, ROT13)Encrypt and decrypt with Caesar, ROT13, ROT47, Vigenere, or Atbash. Includes a brute-force list of all 25 Caesar shifts.
    • Roman Numeral ConverterConvert numbers 1–3999 to Roman numerals and back. Non-standard forms like IIII are flagged with the standard form, with lowercase and Unicode (Ⅻ) output and a quick-reference table.
    • Prime Factorization, GCD & LCM CalculatorFactor an integer into primes, list its divisors with their count and sum, and check primality. Also finds the GCD and LCM of several integers, with BigInt support.
    Show 14 more
    • Permutation & Combination CalculatorCalculate nPr, nCr, factorials and repetition variants exactly, with every digit shown even for huge values.
    • GPA CalculatorCalculate GPA from course credits and grades. Supports 4.0, 4.3 and Japanese university scales.
    • Screen Size CalculatorConvert a screen diagonal in inches to width and height in cm, and get PPI, dot pitch and a viewing distance estimate. Works backwards from cm too.
    • Birthday Info (Zodiac, Star Sign, Birthstone)Look up the zodiac animal, star sign, birthstone, birth flower, and day of the week for any date of birth.
    • Japanese School Grade ChartLooks up the Japanese school grade, entry year, and graduation year from a date of birth, or the birth dates for a grade, with early-born support and an adjustable school year.
    • Anniversary CalculatorList 100-day, monthly and yearly anniversary dates from a start date, with days remaining, plus a countdown to any event.
    • Due Date & Pregnancy Week CalculatorEstimate your due date, current pregnancy week and month, and key milestones from your last period, ovulation date, or a known due date.
    • CSS Text-Shadow GeneratorBuilds multi-layer CSS text-shadow declarations with a live preview, including neon and outline presets.
    • CSS Glassmorphism & Neumorphism GeneratorGenerates CSS for frosted-glass (backdrop-filter) and neumorphic (layered box-shadow) elements with material presets and a live preview.
    • CSS Animation GeneratorBuilds CSS @keyframes animations from presets with cubic-bezier easing, duration, delay, iterations, and a live preview, plus prefers-reduced-motion output.
    • HTTP Status Codes List & SearchSearch HTTP status codes such as 404, 301, 500, and 429 by number, name, or keyword, with meanings, causes, and fixes.
    • MIME Type LookupLook up the MIME type (Content-Type) for a file extension, or the extensions for a MIME type, with partial-match search
    • robots.txt GeneratorGenerate robots.txt with per-user-agent Allow/Disallow rules, sitemaps, and AI bot blocking
    • sitemap.xml Generator (from URL list)Turn a URL list into sitemap.xml with bulk lastmod, changefreq and priority, invalid/duplicate URL removal, and splitting past 50,000 URLs

  15. Added 13 new tools.

    • MinesweeperClassic mine-clearing puzzle with Beginner, Intermediate, Expert and custom boards. Safe first click, long-press flags on touch screens and best times
    • Reversi (Othello)Play Reversi against the computer at four strength levels. Choose first or second, with legal-move hints and undo, right in your browser
    • Maze GeneratorGenerate a random maze by choosing its size and difficulty. Show the solution, save it as a PNG or print it for activity sheets
    • Word Search GeneratorMake a word search puzzle from your own word list. Choose grid size and difficulty, show the answer key, save a PNG or print it for class or parties
    • Crossword GeneratorMake a crossword puzzle from your own answers and clues, with numbered Across and Down clues, an answer key, PNG download and printing
    Show 4 more
    • Color Sense TestA 60-second game of picking the one slightly different color tile. The difference shrinks as you go and your score sets your rank. For fun, not a color vision test
    • Game of LifeConway’s Game of Life in your browser. Draw cells, play, step and adjust speed, and drop in presets like the glider, pulsar and Gosper gun
    • Picross (Nonogram)Play picross puzzles with a single solution in 5×5, 10×10 or 15×15, or turn your own drawing or image into a puzzle
    • Invaders GameA classic invaders-style shooter: shoot down the descending cat fleet. Keyboard and on-screen buttons, shields, a bonus UFO, levels and a best score

  16. Added 5 new tools.

    • Image to ASCII Art ConverterConvert an image into ASCII art with adjustable width, character set and invert, then copy or save it as text
    • JSONL (NDJSON) to JSON / CSV ConverterConvert JSONL (NDJSON, JSON Lines) to and from a JSON array or CSV, skipping blank lines and reporting the line number of bad records
    • Memory MatchFlip emoji cards and find every pair. Choose 12, 16 or 30 cards and save your best moves and time
    • Sliding PuzzlePlay the 15 puzzle with numbers or your own image. 3×3, 4×4 and 5×5, always solvable, with best moves and time
    • 2048Merge tiles to reach 2048 by swiping or with arrow keys. 4×4, 5×5 and 6×6 boards, undo and best scores

  17. Added 7 new tools.

    Show 2 more
    • Random String & Number GeneratorGenerate up to 1,000 random strings from your characters, or random integers and decimals in a range with no duplicates
    • File Type DetectorIdentify a file’s real format from its magic number, warn when the extension does not match, and view a hex dump

  18. Updated 5 tools.

  19. Added 10 new tools.

    • Random Team GeneratorPaste a name list and split it into random teams by team count or team size. Leftovers are spread evenly; reshuffle and copy the result.
    • Bingo Caller & Card GeneratorCall bingo numbers with history and full screen, and print a batch of bingo cards
    • Seating Chart Randomizer & Order ShufflerRandomize a classroom seating chart or speaking order from a name list, with fixed seats and pairs kept apart
    • Omikuji (Daily Fortune)Draw a free Japanese omikuji fortune slip. Get a daily fortune for today, or redraw as often as you like, with lucky color and number.
    • Image Blur & MosaicDrag to select parts of an image and hide faces or personal info with mosaic, blur, or a solid fill.
    Show 5 more
    • Color Palette GeneratorGenerate complementary, analogous and triadic color schemes from one base color and copy HEX, CSS variables or JSON
    • Image Filter & Color AdjustmentAdjust brightness, contrast, saturation, black & white, and sepia with sliders. Compare before and after, then save.
    • Typing Speed TestMeasure your typing speed in English or Japanese romaji. Get WPM, CPM, accuracy and your weakest keys. Accepts alternate romaji spellings.
    • Reaction Time TestClick when the color changes. Measures your average and best reaction time in ms over 5 rounds
    • SudokuPlay sudoku puzzles generated on the spot, with notes, hints and a mistake check

  20. Added 8 new tools.

    • CSS clamp() CalculatorGenerate a fluid typography clamp() expression from min/max font sizes and viewport widths.
    • Time CalculatorTotal work hours, add or subtract time, and convert between h:mm and decimal hours.
    • Fuel Cost CalculatorCalculate fuel cost and cost per km from distance, fuel economy and price, and split a road trip among passengers.
    • Aspect Ratio CalculatorSimplify a width and height to an aspect ratio, or find the missing side from a ratio and one dimension. Includes 16:9 and 4:3 presets.
    • Gacha Probability CalculatorCalculate drop chances, pity cap expectations and gems needed
    Show 3 more
    • URL Parser & Query EditorSplit a URL into protocol, host, path, query and hash, edit parameters and rebuild it
    • Unicode Character InspectorLook up code points, UTF-8/UTF-16 bytes and categories of characters, or convert U+XXXX back to text
    • User-Agent ParserParse a User-Agent string into browser, OS, rendering engine and device type, and see the UA of your own browser automatically.

  21. Added 6 new tools, plus a cat action minigame on the 404 page.

    • Key Pair GeneratorGenerate RSA, ECDSA, or Ed25519 public/private key pairs in PEM format. Keys are created in your browser and never sent.
    • Multi-Step Encode/Decode & Hash ChainChain Base64, URL, hex, HTML escape, MD5/SHA-256 and more in any order and convert in one go, with every intermediate result shown.
    • Find & Replace and Line ToolsBulk find and replace (regex supported), add or remove line numbers, keep or remove lines by keyword, add a prefix or suffix to each line, and reverse line order.
    • OCR-Resistant Image ObfuscatorAdds subtle distortion, noise, and fine lines to text in an image to make automatic OCR reading harder. No guarantee of effect. Saves as PNG.
    • CSP & SRI Hash GeneratorBuild a Content-Security-Policy per directive and copy it as nginx, Apache, or _headers config. Also generates SRI integrity hashes and tags.
    Show 1 more

  22. Added 16 new tools.

    • ZIP Maker & ExtractorBundle files into a ZIP, or open a ZIP, browse its contents and save only the files you need. Works with non-English file names.
    • Screen RecorderRecord your entire screen, a window or a browser tab right in the browser and save it as a video file. Nothing to install.
    • Amidakuji (Ghost Leg) GeneratorCreate an amidakuji ghost-leg ladder from names and outcomes. Hide results and trace one player at a time, reveal everyone, or save it as an image.
    • Text Merge ToolCompare two versions of a text and choose A, B, or both for each difference to merge them into one. Edit the result by hand, then copy or download it.

  23. Added 13 new tools.

    Show 4 more

  24. Added 10 new tools.

    • Image MergerCombines multiple images into one, side by side, stacked, or in a grid, with reordering, spacing, margin, background color, and size matching, saved as PNG, JPEG, or WebP.
    • Add Text or Watermark to ImageAdds text to an image or tiles a watermark across it, with position, size, color, opacity, outline, and angle controls, saved as PNG, JPEG, or WebP.
    • GIF MakerCreates an animated GIF from several images in order, with frame delay, width, background color, looping, and ping-pong playback, all processed in your browser.
    • PDF Page Numbers & WatermarkAdd page numbers and watermark text such as CONFIDENTIAL or DRAFT to every page of a PDF, with position, size, opacity and angle controls.
    • PDF Metadata EditorView, edit or remove a PDF’s title, author, keywords and dates. Handy for clearing personal details before sharing.
    Show 5 more
    • Unicode Escape / UnescapeConverts text to Unicode escapes like \u3042 and back. Supports JavaScript, ES6, Python, U+ notation and HTML numeric references, with correct emoji handling.
    • Zero-Width Character RemoverDetects and removes invisible characters such as zero-width spaces, BOM and bidi controls, showing each type and count before cleaning your text.
    • Reading Time CalculatorPaste text to estimate reading time, speaking time and Japanese manuscript paper sheets (400 or 200 characters). Handles mixed Japanese and English.
    • ID Photo Maker (Passport & Resume)Take a photo with your webcam or phone, or pick one, and crop it to ID photo sizes like 35×45mm or 30×40mm. Fill the margins with any color.
    • Camera Color Picker (Live Eyedropper)Point your camera at anything and pick its color as HEX, RGB or HSL by moving over the live video. Handy for matching paint, clothes and products.

  25. Added 34 new tools, plus a new Hardware category.

    Show 29 more
    • BMR & Calorie CalculatorEstimate your basal metabolic rate and daily calorie needs from age, sex, height, weight, and activity level, with calorie targets for losing or gaining weight.
    • Japan Salary Take-Home Pay CalculatorEstimate annual and monthly take-home pay in Japan from gross salary after social insurance, income tax, and resident tax, using 2025-2026 rules.
    • Furusato Nozei Donation Limit CalculatorEstimate the furusato nozei (hometown tax) donation limit for a ¥2,000 out-of-pocket cost from your salary and deductions, using 2025-2026 rules.
    • Time Zone Converter & World ClockConverts a date and time to the local time in cities around the world at once, with daylight saving support, and doubles as a world clock.
    • Japan Business Day Calculator & Holiday ListFinds the date N business days away and counts business days in a range, skipping weekends and Japanese national holidays, and lists holidays by year.
    • Timer, Stopwatch & Pomodoro TimerA browser stopwatch with laps, a countdown timer, a Pomodoro timer, and a hidden-count challenge to stop at an exact time, with an alarm sound when time is up.
    • Kanji Numeral ConverterConverts Japanese kanji numerals to Arabic digits and back, including formal daiji numerals (壱弐参) used on contracts, and converts every number in a block of text at once.
    • Kyujitai ⇔ Shinjitai ConverterConverts between old kanji forms (國 學 體) and modern forms (国 学 体), including name variants like 髙 and 﨑, and lists the characters it changed.
    • My Number & Corporate Number ValidatorValidates or calculates the check digit of a Japanese My Number (12 digits) or Corporate Number (13 digits, incl. the invoice registration number). Nothing is sent to a server.
    • Romaji ⇔ Hiragana ConverterConverts romaji to hiragana or katakana, and kana to romaji in Hepburn or Kunrei-shiki style, with options for long vowels and letter case.
    • English to Katakana ConverterConverts English words to katakana from their spelling using simple rules and a small dictionary of common words, and can spell out acronyms like USB.
    • Unicode Text DecoratorConverts letters and numbers into fancy Unicode text such as bold, italic, script, circled, fullwidth and strikethrough, ready to paste into bios and usernames.
    • Special Characters & Emoji ListA click-to-copy list of stars, hearts, arrows, circled numbers, unit symbols, kaomoji and emoji, with keyword search.
    • Roulette, Random Picker & DiceSpin a roulette wheel from your own list, draw several winners without repeats, or roll dice like 1d6 and 2d6+3 using cryptographic randomness.
    • QR Code Reader (Camera & Image)Scan QR codes with your camera or from an image file, with URLs and Wi-Fi details recognized automatically. Reads common barcodes too in supporting browsers.
    • HEIC to JPG ConverterConverts iPhone HEIC and HEIF photos to JPEG, PNG, or WebP, with batch conversion and adjustable quality.
    • PDF RedactorBlack out names, addresses and amounts in a PDF by dragging, and export a file where the hidden text cannot be recovered.
    • Text Encryptor & DecryptorEncrypt text with a password using AES-256-GCM and share it as Base64, then decrypt it with the same password.
    • HMAC GeneratorCompute HMAC-SHA1/256/384/512 signatures from a message and secret key, and compare them with a received signature.
    • TOTP Code GeneratorGenerate and verify 2FA TOTP codes from a Base32 secret or an otpauth:// URI, for debugging and testing.
    • Bcrypt Hash Generator & VerifierGenerate a bcrypt hash from a password and verify it against an existing hash, with an adjustable cost factor.
    • X.509 Certificate DecoderPaste a PEM SSL/TLS certificate to read its issuer, validity dates, SANs, public key, and fingerprints.
    • SSH Key Fingerprint ViewerCompute the SHA256 and MD5 fingerprint of an SSH public key, including multi-line authorized_keys.
    • XML to JSON ConverterConverts between XML and JSON, handling attributes and text, and reports syntax errors such as unclosed tags with line and column.
    • .env to JSON ConverterConverts between .env files and JSON, handling comments, export prefixes, and quoted values.
    • CSV/TSV to Markdown Table ConverterConverts CSV or TSV (including tables copied from Excel) into a Markdown table, with column alignment, padding, and optional header row.
    • HTML Table to CSV ConverterConverts an HTML <table> to CSV or TSV, expanding merged cells, choosing among multiple tables, and adding a BOM for Excel.
    • JSON Tree ViewerBrowse JSON as a collapsible tree, search keys and values, and copy the path (JSONPath or JSON Pointer) of any node.
    • JSON Schema GeneratorGenerates a JSON Schema from a JSON sample, with draft 2020-12, 2019-09, or 07, required keys, additionalProperties, and format detection.

  26. Added 11 new tools.

    • cURL to Fetch / Axios ConverterConverts a curl command to JavaScript fetch or axios code. Handles headers, JSON bodies, form data, and basic auth; it only parses the command and never sends a request.
    • JSON to Types ConverterGenerates type definitions from JSON as TypeScript interfaces, C# classes, Go structs, Python dataclasses, or Java records, handling nested objects, arrays, optional and nullable fields.
    • JSON DiffCompares two JSON documents structurally and lists added, removed, and changed values with their paths. Ignores key order, with an option to ignore array order.
    • Barcode GeneratorGenerates CODE128, EAN-13, EAN-8, UPC, CODE39, and ITF barcodes and lets you download them as PNG images.
    • ULID & NanoID GeneratorGenerates 1 to 100 time-sortable ULIDs or compact, URL-friendly NanoIDs at once, with custom length and alphabet for NanoID.
    Show 6 more
    • Password Strength CheckerRates a password by length, character types, and weak patterns like sequences and keyboard runs, and estimates how long it would take to crack.
    • File Hash CalculatorDrag and drop files to calculate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes, and compare them with a published checksum.
    • SVG to PNG ConverterConverts SVG files or code to PNG at 1x to 4x resolution, with a transparent, white, or custom background.
    • OGP Image GeneratorCreates a social share (OGP) image at 1200×630 as PNG from a title and site name, with adjustable background and text colors.
    • Image Cropper, Rotator & FlipperCrops images to any area, rotates in 90° steps, and flips horizontally or vertically, with aspect ratio locking and PNG, JPEG, or WebP output.
    • Image Background Remover (With Outline)Makes a solid-color background transparent and saves a PNG, with edge cleanup for leftover background color and an optional outline of any color and width.

  27. Added features that make tools easier to find and use.

    • Added a command palette (Ctrl+K) for finding tools.
    • Added keyboard shortcuts.
    • Added a "🔒 Runs in your browser" badge.
    • Added category listing pages.
    • Added pre-filling inputs via URL query.
    Show 6 more
    • Inputs are now kept across reloads and language switches.
    • Added a back-to-top button.
    • Added more share targets (Threads, Bluesky, Reddit).
    • Added print-friendly layouts.
    • Improved accessibility, including a skip link.
    • Expanded FAQs, notes, and how-to guides on tool pages.

  28. Added BreadcrumbList structured data so breadcrumbs can appear in search results.

  29. Added 3 new tools.

    • px to rem ConverterConverts between px and rem in real time with a customizable base font size.
    • Color Contrast Checker (WCAG)Calculates the contrast ratio between text and background colors and checks it against WCAG AA/AAA levels for normal and large text.
    • Meta Tag & OGP GeneratorGenerates basic meta tags, Open Graph (OGP), and Twitter Card tags from a page title, description, URL, and image, with a social share preview.

  30. Added 5 new tools.

    • Webcam & Microphone TestCheck your webcam video, actual resolution, frame rate (FPS) and microphone level in the browser. Ideal before a call or stream.
    • Base Converter (Binary/Octal/Decimal/Hex)Converts numbers between binary, octal, decimal, and hexadecimal in real time. Supports 0x/0b/0o prefixes and negative numbers.
    • CSS Gradient GeneratorBuilds linear/radial CSS gradients with a live preview from color stops, angle, and shape.
    • CSS Box-Shadow GeneratorBuilds multi-layer CSS box-shadow declarations with a live preview from offset, blur, spread, color, and inset.
    • CSS Border-Radius GeneratorBuilds a CSS border-radius with a live preview from four independent (or linked) corner values, with px/% unit switching.

  31. Added the PDF to Markdown Converter.

    • PDF to Markdown & Text ConverterExtract PDF text and convert it to Markdown or plain text with headings, lists and tables detected. Handy for preparing documents for AI tools.

  32. Added 9 new tools, and reorganized tool categories into 9 groups.

    • SVG Optimizer (SVGO)Optimizes SVG files or code with SVGO, stripping unnecessary metadata to reduce file size.
    • Placeholder Image GeneratorGenerates dummy placeholder images from a width, height, colors, and text, and saves them as PNG, JPEG, or WebP.
    • PDF Merge, Split & ExtractMerge several PDFs into one, split a PDF by page count, or extract just the pages you need.
    • PDF ⇔ Image ConverterConvert PDF pages to PNG or JPEG images, or combine several images into one PDF.
    • PDF CompressorReduce PDF file size by recompressing each page as an image.
    Show 4 more
    • PDF Page EditorRotate, delete and reorder PDF pages, or remove the password from a PDF you know the password for.
    • Cat Logo Text GeneratorCreates cat-style logo text and lets you place ears, whiskers, paws, hearts, stars and moons freely, then saves it as a transparent PNG.
    • PDF Password ProtectorAdd a password to a PDF and encrypt it with AES-256, with optional print/copy/edit restrictions.
    • Encoding Converter & Mojibake FixerDetects a text file's encoding and converts between Shift_JIS, EUC-JP and UTF-8. Diagnoses and repairs garbled text.

  33. Added 7 new tools, plus a favorites feature for bookmarking tools.

    • Image Format ConverterConverts PNG, JPEG, GIF, and BMP images to WebP, JPEG, or PNG with adjustable quality, and supports converting several files at once.
    • Image Resizer & CompressorResizes images by pixel size or percentage and compresses them to WebP, JPEG, or PNG, with support for processing several files at once.
    • Image to Base64 ConverterConverts an image file to a Base64 string or Data URL, and converts a Base64 string or Data URL back into a downloadable image.
    • Favicon GeneratorGenerates favicon.ico (bundling 16/32/48px) and multiple PNG sizes (apple-touch-icon, etc.) from a single image, plus the HTML link tags to reference them.
    • EXIF Viewer & RemoverReads a JPEG photo's Exif metadata (date taken, camera, lens, exposure, GPS location, and more), and lets you download a copy with only the Exif data removed, at full quality.
    Show 2 more

  34. Added 6 new tools.

    • Ratio & Percentage CalculatorReduces a ratio to its simplest whole-number form, solves for a missing term in a proportion, and converts between a part, a whole, a percentage, and a rate of change.
    • BMI CalculatorCalculates your Body Mass Index from height and weight, shows the WHO weight category, and gives the healthy weight range for your height.
    • Freelancer Take-Home Pay CalculatorEstimates a Japanese freelancer's income tax, reconstruction surtax, and resident tax from annual revenue, expenses, and deductions, with a rough take-home pay figure.
    • Mortgage Prepayment Comparison CalculatorCompares the interest saved, term shortened, or monthly payment reduced by a lump-sum mortgage prepayment, for both the "shorten term" and "reduce payment" strategies.
    • Investment Growth SimulatorSolves for any one of initial investment, monthly contribution, annual return, or time horizon from the other three under compound interest, with a chart and year-by-year table, plus a sustainable monthly withdrawal estimate.
    Show 1 more
    • JASSO Student Loan Repayment SimulatorEstimates the monthly payment, total repayment, and total interest for a JASSO Type 2 (interest-bearing) student loan, comparing the fixed-rate and rate-review repayment methods.

  35. Added the Text Case Converter, and finished translating all 37 tools into English.

    • Text Case ConverterConverts text into 9 naming conventions at once, including camelCase, PascalCase, snake_case, and kebab-case. Handy for renaming variables and functions.

  36. Added 16 new tools.

    • SQL FormatterFormats and minifies SQL queries, with support for MySQL, PostgreSQL, SQLite, BigQuery and other dialects, indent width, and keyword case.
    • CSS/JS/HTML MinifierFormats and minifies CSS, JavaScript, and HTML code, with a selectable indent width.
    • Chmod Permission CalculatorConverts file permissions between checkboxes, octal notation (e.g. 755), and symbolic notation (e.g. rwxr-xr-x), with setuid/setgid/sticky bit support.
    • CIDR / Subnet CalculatorCalculates the network address, broadcast address, and usable host count from CIDR notation or an IP address plus subnet mask.
    • Keycode (e.code / e.key) CheckerShows the event.key, event.code, keyCode, location, and modifier keys of any key you press, in real time. Handy for checking values while implementing keyboard event handling.
    Show 3 more
    • Screen Size & Viewport CheckerShows the viewport size, window size, screen resolution, device pixel ratio, and current Tailwind CSS breakpoint in real time. Handy for checking responsive designs.
    • JSON Path / JSON Pointer TesterTests a JSONPath or JSON Pointer (RFC 6901) query against your JSON data and lists every matched value with its absolute path. Handy for checking a query before pulling a value out of an API response.
    • TOML to JSON/YAML ConverterConverts between TOML, JSON, and YAML, handy for checking a TOML config file like Cargo.toml or pyproject.toml.

  37. Added 14 new tools, plus About, FAQ, Contact, and Terms of Service pages and security headers (CSP).

    • Machine-Dependent Character CheckerDetects machine-dependent characters such as circled numbers, Roman numerals, and ligatures like ㈱ ㍉ ㍻, with a safe replacement suggestion for each.
    • Regex TesterTests a regular expression against sample text with match highlighting, a capture group list, and a live replacement preview.
    • Text Diff CheckerCompares two texts line by line and highlights added and removed lines, with options to ignore whitespace or case differences.
    • JWT DecoderDecodes a JWT (JSON Web Token) and displays its header and payload as formatted JSON, with time-based claims like exp/iat shown as human-readable dates. The signature is not verified.
    • Dummy Text GeneratorGenerates Lorem ipsum (Latin) or Japanese placeholder text by paragraphs, sentences, or words, in any count you choose.
    Show 9 more
    • Text List Deduplicate, Sort & ShuffleDeduplicates, sorts (alphabetical, reverse, or numeric), or randomly shuffles newline-separated text, with options to remove empty lines and trim whitespace.
    • Line Ending ConverterDetects the line endings (LF, CRLF, or CR) in your text and converts them all to the type you choose.
    • Cron Expression SimulatorExplains a cron expression in plain English and lists its upcoming run times. Handy for checking crontab or GitHub Actions schedules.
    • Japanese Era ConverterConverts between the Japanese era calendar (Meiji, Taisho, Showa, Heisei, Reiwa) and the Western year, with an era reference table covering transition dates.
    • Date CalculatorCalculates the difference in days between two dates, or the date a set number of days before or after a given date, with an option to count both endpoints.
    • Age CalculatorCalculates the exact age, traditional East Asian age, days lived, and days until the next birthday from a date of birth, with a customizable reference date.
    • Hourly Wage Converter & Overtime Pay CalculatorConverts between hourly, daily, monthly, and annual wages, and simulates overtime, holiday, and late-night premium pay.
    • Consumption Tax & Discount CalculatorConverts between tax-included and tax-excluded prices, and calculates the discounted price from a discount rate or amount.
    • HTML/JS String Escape & UnescapeEscapes and unescapes HTML special characters (& < > " ') and JavaScript string escape sequences such as newlines and quotes.

  38. Launched NyankoTools with 15 tools to start, along with dark mode and an English version of the site.

    • Character CounterCounts characters, words, and lines in real time, plus the length against X (Twitter)'s 280-character limit.
    • JSON FormatterFormats and minifies JSON data, with clear syntax error messages.
    • Base64 Encoder/DecoderConverts text to and from Base64, with full support for multibyte characters.
    • URL Encoder/DecoderConverts text to and from percent-encoding, with full support for multibyte characters in query parameters.
    • UUID GeneratorGenerates 1 to 100 random UUIDs (v4) at once, with optional hyphen removal and uppercase formatting.
    Show 10 more
    • Password GeneratorGenerates strong random passwords by choosing character types (uppercase, lowercase, numbers, symbols) and length, with a strength estimate.
    • Hash GeneratorComputes MD5, SHA-1, and SHA-256 hashes from text in real time.
    • QR Code GeneratorGenerates a QR code from a URL or text and downloads it as a PNG, with a selectable error correction level.
    • Color ConverterConverts color codes between HEX, RGB, and HSL, with a color picker for choosing colors visually.
    • Unix Timestamp ConverterConverts between a Unix timestamp (epoch seconds or milliseconds) and a date/time, and shows the current timestamp.
    • Full-width / Half-width ConverterConverts between full-width and half-width for alphanumerics, symbols, katakana, and spaces, with each character type selectable individually.
    • Hiragana / Katakana ConverterConverts Japanese text between hiragana and katakana — handy for learners checking vocabulary, flashcards, and loanwords.
    • YAML to JSON ConverterConverts between YAML and JSON, handy for checking Docker Compose or GitHub Actions config files.
    • CSV to JSON ConverterConverts between CSV and JSON using the header row as keys, with support for comma/tab delimiters and quoted fields.
    • Markdown to HTML ConverterConverts Markdown to HTML with a live preview, and HTML back to Markdown. Handy for checking a README or article draft.

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